Most Helpful Girl
Aww, bless her! I have this problem and I'm 36, I've had the problem all my life so long before GHDs were available. I would say you're right and to leave the straighteners for special occasions, she's so young. She'll no doubt use them daily in a few years so best put that off as long as you can. ;) Okay, so shampoos with 'silicone' in are great, anything from Pantenne, the Aussie range is also brilliant. Leave in conditioners are a must, Pantenne do some good ones. Serum is also a must, Frizz Ease do a good one which I'm using. Also, if she can stand it, a blast of cold water after washing her hair closes the cuticles and makes the hair smoother.
I hope this all helps a bit, I'm an authority on frizzy hair. lol